What Does Influenza Actually Do to Your Airway?
Medically reviewed by our MD Laboratory Director (a role required by CLIA; the director's name is on file in the CMS CLIA database, #45D2048957, and can be verified independently) · Editorial policy
Influenza destroys the ciliated cells that sweep your airway clean. That is why the cough lingers.CLIA #45D2048957 · CAP #8722734 · Same-day results · Walk-ins welcome
Hemagglutinin (H) binds sialic acid receptors on respiratory epithelium; the virus enters, replicates, and neuraminidase (N) cleaves those receptors so new virions can be released. The infected ciliated cells — the ones whose job is to sweep mucus and debris out of your lungs — are destroyed. That is why a post-influenza cough can persist for weeks after the fever is gone, and why secondary bacterial pneumonia is a recognized complication.
Not sure what you need? Text us and we will set it up.
📱 Text (713) 832-8892 📞 Call (713) 266-0808
📱 Text (713) 832-8892 📞 Call (713) 266-0808
3707 Westcenter Dr Suite 100, Houston, TX 77042 · Walk-ins welcome
H and N are not trivia
| Protein | Function | Clinical relevance |
|---|---|---|
| Hemagglutinin (H) | Binds host receptors; entry | Determines host range; main target of immunity and vaccines |
| Neuraminidase (N) | Releases new virions | Target of neuraminidase-inhibitor antivirals (CDC) |
| Subtype (e.g. H1N1, H3N2, H5N1) | The H/N combination | Why an "unsubtypeable influenza A" is a public-health alarm — see this |
PCR does not look at the virus's shape. It targets conserved genetic sequences — which is why it detects influenza before enough viral protein has accumulated for an antigen test to see it.
Go to an emergency department, not a lab, if you have: shortness of breath at rest, chest pain or pressure, blue lips, confusion, inability to stay awake, or a child breathing fast, grunting, or pulling in at the ribs.
We name drugs, never doses. Treatment statements follow CDC and IDSA guidance; dose and duration are a physician's decision.
Why same-day matters in respiratory illness. Influenza antivirals work best within 48 hours of onset. Swab by 1:00 PM → result at 4:30 PM → licensed physician (partner network) 4:30–6:00 PM. Two stops, both the same day.
FAQ
- Why is my cough still there after two weeks?
- Ciliated epithelium takes time to regenerate. A worsening cough with fever, though, needs a clinician — secondary bacterial pneumonia is real.
- Why do antivirals need to be early?
- Because they interfere with viral replication, and replication peaks early. See the 48-hour window.
- Does the flu shot still help if I am infected?
- Vaccination is prevention, not treatment. Talk to the physician about antivirals.
- How fast is testing?
- Same day at 4:30 PM; STAT about 2 hours.
Not sure what you need? Text us and we will set it up.
📱 Text (713) 832-8892 📞 Call (713) 266-0808
📱 Text (713) 832-8892 📞 Call (713) 266-0808
3707 Westcenter Dr Suite 100, Houston, TX 77042 · Walk-ins welcome